From Javier Taibo, " I have found that since version 1.1, FFMPEG changed the way audio streams are retrieved, from packed to planar format. SDL interprets packed audio, as is used in the osgmovie example. To make the audio work when the OSGffmpeg plug-in is compiled against recent FFMPEG versions, FFmpegDecoderAudio must check for planar formats and in these cases request the samples as packed. This way all works as before. It can be checked with osgmovie example application.

  $ osgmovie --audio movie.avi.ffmpeg
  FFmpegImageStream::open audio failed, audio stream will be disabled: unknown audio format

  With the attached FFmpegDecoderAudio.cpp, audio sounds correctly.

  I am also attaching a modified version of FindFFmpeg.cmake that allows to set as FFMPEG_DIR the ffmpeg compiled in the source directory structure. It should not break anything as it only adds some additional search paths.

"

Note from Robert Osfield, I have found in testing that audio quality is not good for planar floating point formats, even with adding support for SDL2 to the osgmovie example. I haven't yet tracked down the cause of these audio problems or a solution.


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14609 16af8721-9629-0410-8352-f15c8da7e697
Added support for using SDL2 to the osgmovie to enable it to handle floating point audio formats


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14610 16af8721-9629-0410-8352-f15c8da7e697